Multilayer Stretched Polyamide Film Lamination Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer polyamide films used in packaging face issues with delamination when a sealing layer is laminated, leading to immeasurable lamination strength, aroma leakage, and poor thermal dimensional stability, which affects the quality and commercial value of packaged goods.
Innovation Solution
A multilayer stretched polyamide-based film comprising a three- or four-layer laminate structure with a polyester layer, an adhesive layer, and a polyamide layer, where the polyamide layer contains a combination of aliphatic and aromatic polyamides, and a sealing layer is laminated on the polyamide layer after biaxial stretching, enhancing lamination strength, aroma retention, and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a multilayer film with polyester/polyamide laminated structure is used to improve dimensional stability and aroma retention, then thermal dimensional stability and aroma retention are improved, but lamination strength deteriorates due to delamination when sealing layer is laminated
Solution Approach 1:
The invention divides the polyamide layer into two separate layers: an aliphatic polyamide layer (providing toughness and flexibility) and an aromatic polyamide layer (providing thermal stability and aroma retention). This segmentation allows each layer to perform its specific function while both contribute to good lamination characteristics with the sealing layer, resolving the delamination issue.
Solution Approach 2:
The invention uses a composite structure combining aliphatic polyamide and aromatic polyamide layers. The aliphatic polyamide provides good lamination characteristics and flexibility, while the aromatic polyamide provides thermal stability and aroma retention. This composite material approach allows simultaneous achievement of thermal stability, aroma retention, and measurable lamination strength.
2Temperature
If amorphous polyamide is used in the multilayer film to improve heat resistance and transparency, then heat resistance and transparency are improved, but aroma retention deteriorates
Solution Approach 1:
The invention combines aromatic polyamide (providing heat resistance and aroma retention) with aliphatic polyamide (providing toughness and flexibility). The aromatic polyamide layer specifically addresses the aroma retention issue while maintaining the heat resistance benefits, creating a composite structure that overcomes the limitations of using amorphous polyamide alone.
3Quantity of substance
If the multilayer film is made thinner to reduce packaging material usage, then material cost is reduced, but bending resistance deteriorates due to pinhole formation during conveyance
Solution Approach 1:
By segmenting the polyamide layer into two specialized layers, the invention achieves high reliability and bending resistance even at thin overall film thickness. The aliphatic polyamide layer provides flexibility and pinhole resistance, while the aromatic polyamide layer maintains structural integrity, allowing thin-film construction without sacrificing bending resistance.
4Object-generated harmful factors
If polyester/polyamide laminated structure is used to improve aroma retention, then aroma retention is improved, but curl resistance deteriorates
Solution Approach 1:
The segmentation of the polyamide layer into aliphatic and aromatic components allows independent optimization of different properties. The aliphatic polyamide layer provides flexibility and curl resistance, while the aromatic polyamide layer maintains aroma retention, resolving the contradiction between these two properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The film exhibits excellent bending resistance, thermal dimensional stability, aroma retention, and curl resistance, with measurable lamination strength, making it suitable for packaging applications.
Implementation Method 1
A multilayer stretched film obtained by biaxially stretching a multilayer laminate comprising three layers consisting of a polyester layer (Layer A), an adhesive layer (Layer B), and a polyamide layer (Layer C)
Data Source
AI summary
An object of the present invention is to provide a multilayer stretched polyamide-based film having excellent bending resistance, thermal dimensional stability and aroma retention, whose lamination strength is measureable when a sealing layer is laminated thereon.Specifically, the invention provides a multilayer stretched polyamide-based film obtained by biaxially stretching a multilayer laminate including three layers consisting of a polyester layer (Layer A), an adhesive layer (Layer B), and a polyamide layer (Layer C), whereinLayer A contains a crystalline polyester,Layer B contains a modified polyester-based elastomer,Layer C contains an aliphatic polyamide, andLayer C has a thickness of 5 μm or more, andwherein a sealing layer is to be laminated on Layer C by a lamination method, after biaxially stretching the multilayer laminate.